Role of Charge Density Wave in Monatomic Assembly in Transition Metal Dichalcogenides

Abstract

The charge density wave (CDW) in transition metal dichalcogenides (TMDs) has drawn tremendous interest due to its potential for tailoring their surface electronic and chemical properties. Due to technical challenges, however, how the CDW could modulate the chemical behavior of TMDs is still not clear. Here, this work presents a study of applying the CDW of NbTe 2 , with a high transition temperature above room temperature, to generate the assembling adsorption of Sn adatoms on the surface. It is shown that highly ordered monatomic Sn adatoms with a quasi-1D structure can be obtained under regulation by the singleaxis CDW of the substrate. In addition, the CDW modulated superlattices could in turn change the surface electronic properties from semimetallic to metallic. These results demonstrate an effective approach for tuning the surface chemical properties of TMDs by their CDWs, which could be applied in exploring them for various practical applications, such as heterogeneous catalysis, epitaxial growth of low-dimensional materials, and future nanoelectronics. Disciplines DisciplinesEngineering | Physical Sciences and Mathematics AbstractThe charge density wave (CDW) in transition metal dichalcogenides (TMDs) has drawn tremendous interest due to its potential for tailoring their surface electronic and chemical properties. Due to technical challenges, however, how the CDW could modulate the chemical behavior of TMDs is still not clear. Here, this work presents a study of applying the CDW of NbTe2, with a high transition temperature above room temperature, to generate the assembling adsorption of Sn adatoms on the surface. It is shown that highly ordered monatomic Sn adatoms with a quasi-one-dimensional structure can be obtained under regulation by the single-axis CDW of the substrate. In addition, the CDW modulated superlattices could in turn change the surface electronic properties from semi-metallic to metallic. These results demonstrate an effective approach for tuning the surface chemical properties of TMDs by their CDWs, which could be applied in exploring them for various practical applications, such as heterogeneous catalysis, epitaxial growth of low-dimensional materials, and future nanoelectronics.Received: ((will be filled in by the editorial staff)) Revised: ((will be filled in by the editorial staff)) Published online: ((will be filled in by the editorial staff))

Direct identification of Mott Hubbard band pattern beyond charge density wave superlattice in monolayer 1T-NbSe2

“…The unconventional UHB spatial distribution at low temperature is probably associated with a low-temperature condensation process, similar to superconductivity, and paramagnetism. With the high CDW transition temperature above RT, our 1T-NbSe 2 facilitates the application of CDW pattern as a template for mono-atomic dispersion 41 , such as heterogeneous catalysis, nanoscale magnetic quantum dots.…”

Ultrafast Carrier Dynamics in 2D NbTe2 Thin Films

“…Each monolayer is composed of an Nb layer sandwiched by two Te layers, where the Nb atoms are displaced within the plane to form "trimers," whereas the Te atoms present an out-of-plane buckling. 28,32 The Te-Nb-Te sandwiches stack with weak van der Waals interactions to form a layered structure. 1(c) shows the AFM height profile of the NbTe2 flake, which indicates that the thickness of the flake is ⁓ 28 nm.…”

Metallic Transition Metal Dichalcogenides of Group VIB: Preparation, Stabilization, and Energy Applications

“…For instance, Feng et al subtly exploited the charge density wave (CDW) of NbTe 2 substrate to absorb Sn adatoms to tailor its chemical properties. [307] As a result, by rationally using the single-axis CDW of substrate, not only the Sn superlattices could be fabricated (which may be contributed to catalysis), but also the electronic property of substrate's surface is changed from semimetallic to metallic. This could be a good example for the regulation of electronic properties of group VIB TMDs.…”